scholarly journals Water level management plan based on the ecological demands of wintering waterbirds at Shengjin Lake

2021 ◽  
pp. e01567
Author(s):  
Yiqun Zhang ◽  
Lizhi Zhou ◽  
Lei Cheng ◽  
Yunwei Song
Keyword(s):  
Water Level ◽  
Management Plan ◽  
Water Level Management

scholarly journals Mercury Distribution in an Upper St. Lawrence River Wetland Dominated by Cattail (Typha Angustifolia)

2021 ◽  
Author(s):  
Evie S Brahmstedt ◽  
Carla N Ayala Crespo ◽  
Thomas M Holsen ◽  
Michael Twiss
Keyword(s):  
Water Level ◽  
Plant Biomass ◽  
Management Plan ◽  
Hydric Soils ◽  
Water Level Fluctuations ◽  
Organic Detritus ◽  
Riparian Wetland ◽  
Water Level Management ◽  
Living Tissues ◽  
St Lawrence River

Abstract Legacy mercury (Hg) exists in Upper St. Lawrence River wetland hydric soils and is impacted by a new water level management plan (established in 2017) implemented to restore biodiversity and reduce the monotypic nature of riparian wetlands, currently dominated by Typha spp.. The distribution of Hg within the various components of a riparian wetland provides insight into potential impacts of water level fluctuations. Hydric soil represents 83% of the wetland Hg burden while wetland plant biomass contributed 17%, mostly due to organic detritus (13%). Although Typha roots had a bioconcentration factor of 1.2 (relative to hydric soils) and had the highest total Hg among living tissues (25 ± 9.3 ng/g dry wt.), detritus had the highest overall Hg content (110 ± 53 ng/g dry wt.). While root tissue Hg correlated significantly with soil Hg (p = 0.045), it was determined here that Typha spp. has limited use as a biomonitor in wetlands with low levels of Hg contamination, as in this ecosystem. Hg contained within the organic detritus contributed more to the overall Hg burden in these monotypic Typha wetlands than any other tissue or biomass component analyzed. Consequently, shifts in the plant community that are expected to result from a new water level management plan may alter Hg storage within these wetlands and affect its mobility in this ecosystem.

scholarly journals Characteristics and Management Plan for the Distribution of Nelumbo nucifera community in Junam Wetland

2021 ◽  
Vol 24 (5) ◽  
pp. 469-483
Author(s):  
Soo-Dong Lee ◽  
Han Kim ◽  
Bong-Gyo Cho ◽  
Gwang-Gyu Lee
Keyword(s):  
Environmental Factors ◽  
Water Level ◽  
Soil Depth ◽  
Weather Conditions ◽  
Physicochemical Characteristics ◽  
Management Plan ◽  
Wildlife Habitat ◽  
Nelumbo Nucifera ◽  
Quality Analysis ◽  
Water Level Management

Background and objective: If the Nelumbo nucifera spreads in a wetland at a high density, it can have considerable positive and negative ecological effects on habitats. For this reason, it is necessary to precisely investigate the impacts of its rapid proliferation. This study was conducted to propose the distribution and management of N. nucifera, which can cause the degradation of wildlife habitats due to the rapid spread of internal and external environmental factors that may affect the Junam wetland ecosystem. Methods: For the investigation and analysis of physical and ecological characteristics, factors of the abiotic environment such as general weather conditions, topography and water depth structure, and soil and water quality analysis, and bioenvironment characteristics such as changes in the N. nucifera community distribution were evaluated. To assess whether the differences in the soil depth and physicochemical characteristics between the N. nucifera community and the aquatic plant community are statistically significant, a One-way ANOVA was executed. Results: N. nucifera was presumably introduced in approximately 2007 and observed at a prevalence of only 0.8% in 2009, but had expanded to 11.1% in 2014. After that, the area was increased to 19.3% in 2015 and 40.0% in 2017, about twice that of the previous survey year. The rapid diffusion of an N. nucifera colony can have adverse effects on wildlife habitats and biodiversity at Junam Wetland. To solve these problems, four management methods can be proposed; water level management, mowing management, installation of posts and removal of lotus roots. Control of the N. nucifera community using these methods was judged to be suitable for cutting and water level management when considering expansion rate, water level variation, and wildlife habitat impacts. Conclusion: As the biotic and abiotic environmental factors are different for each wetland, it is necessary to determine the timing and method of management through a detailed investigation.

Ecosystem development in Lake Volkerak-Zoom: concept and strategy

1995 ◽  
Vol 31 (8) ◽  
pp. 239-243 ◽  
Author(s):  
W. Ligtvoet ◽  
S. A. de Jong
Keyword(s):  
Water Level ◽  
Fish Stock ◽  
Ecosystem Development ◽  
Optimal Conditions ◽  
Stock Management ◽  
Key Factors ◽  
Integrated Water Management ◽  
Ecological Concepts ◽  
Freshwater System ◽  
Water Level Management

In the 6000 ha Lake Volkerak-Zoom, a new freshwater system in the estuarine southwest of The Netherlands, biomanipulation is used as a tool in ecosystem development. The basic ecological concepts for ecosystem development are described. Key factors in the integrated water management are fish stock management and water level management, geared towards creating optimal conditions for northern pike, the dominant predator in mesotrophic waters. The main aspects of the water level management and the fish stock management are outlined.

Groundwater-surface water relations in regulated lowland catchments; hydrological and hydrochemical effects of a major change in surface water level management

2019 ◽  
Vol 660 ◽  
pp. 1317-1326 ◽  
Author(s):  
Joachim Rozemeijer ◽  
Janneke Klein ◽  
Dimmie Hendriks ◽  
Wiebe Borren ◽  
Maarten Ouboter ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Level ◽  
Water Relations ◽  
Major Change ◽  
Water Level Management

Effect of 2,4-D and Various Salts on Eurasian Watermilfoil

Weed Science ◽  
1974 ◽  
Vol 22 (6) ◽  
pp. 591-594 ◽  
Author(s):  
Ronald A. Stanley
Keyword(s):  
Acetic Acid ◽  
Water Level ◽  
Aquatic Weed ◽  
Eurasian Watermilfoil ◽  
Laboratory Conditions ◽  
Mutual Antagonism ◽  
Tennessee Valley ◽  
Water Level Management ◽  
Dichlorophenoxy Acetic Acid

The management of Eurasian watermilfoil, an inimical aquatic weed in the Tennessee Valley, involves the use of water level management and herbicidal treatment with 2,4-D [(2,4-dichlorophenoxy)acetic acid]. The possible use of other chemicals to make 2,4-D more effective was tested by measuring growth of Eurasian watermilfoil under laboratory conditions with combinations of sublethal levels of 2,4-D and partially inhibitory concentrations of AlCl3, NH4Cl, Na2AsO2, BaCl2, Na2B4O7, CuSO4, HgCl2, Pb(NO3)2, NaCl, and ZnSO4. At the levels tested, BaCl2, Pb(NO3)2, and ZnSO4were only additive in effect with 2,4-D. Other compounds produced synergism at some concentrations and mutual antagonism at other levels. The greatest synergism was obtained by using HgCl2, AlCl3, and NaCl at 0.2 μM, 10.0 μM, and 200.00 mM respectively.

scholarly journals Effects of water-level management on nesting success of common loons

2013 ◽  
Vol 77 (8) ◽  
pp. 1626-1638 ◽  
Author(s):  
Steve K. Windels ◽  
Erik A. Beever ◽  
James D. Paruk ◽  
Aleya R. Brinkman ◽  
Jennifer E. Fox ◽  
...  
Keyword(s):  
Water Level ◽  
Nesting Success ◽  
Common Loons ◽  
Water Level Management
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